‘I have some weird, seemingly hollow, green, round balls falling from my oak tree. What in the world are these things?” — S.Y. You are describing an interesting growth that can occur on a variety of ...

Welcome to our tree column, “Ask your local arborist.” Each month, arborists from the Davey Tree Expert Company in Menlo Park discuss a tree-related topic from general care and planting tips to how ...

Old water oaks (Quercus nigra) are prone to developing decay in their trunks as they age. Because of this, their life ...

The Mediterranean oak borer, a miniscule beetle no bigger than a sesame seed, has been discovered in trees around the Portland area. The invasive pest native to Europe, the Middle East and North ...

An invasive insect from Europe and the Middle East is attacking several Oregon white oak trees in the Wilsonville area, and state researchers say it's been found in other pest traps in the past few ...

A drive to the mountains in San Diego County means you're surrounded by nature, trees especially, which have been facing a major threat from something so small you might not even notice it. You will ...

Q: I live in a rural area that is surrounded by large oak trees. They attract a variety of squirrels and other wildlife. Other than fencing off every tree, is there any way of protecting fruit trees ...

A tiny insect is silently killing California's coast live oaks. First spotted in Ventura County last year, the goldspotted oak borer has already left a trail of dead trees across Southern California, ...

Interestingly enough, I noticed the same thing under an oak tree in my backyard this morning while I was out with our dogs. There were a lot of 12- to 18-inch branch tips from the ends of branches ...

Question: Yesterday I read that “oaks are a keystone species”. What exactly does that mean? Answer: A keystone species is a plant, animal or microorganism that is vitally important to its environment.